=== X(RS)-Modul ===
The X-drives for the CPC 664/6128 are connected directly to the floppy port. To provide VDOS, a "X-Modul" had to be installed. This was a single-ROM board with VDOS 2.0-X and came in two versions, one of which providing an additional RS232-C interface ("XRS-Modul"). The version versions for the CPC 464 came with a chunky housing in which both the X(RS)-Modul and the DDI-1 had to be installed.
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